You can get automatic and remote control versions of these. RGB / Component is also be widely used now and will still give you the same quality picture as you've got.
There are three main levels of HD; 720p, 1080i, 1080P. Then 100Hz - imagine what you're watching as 35mm film; anything fast moving it slows down and inserts frames so that it appears to be smoother. - clever eh!
A HD source is needed really to get the best from any HD setup; Sky HD, VirginMedia etc, or a BluRay player or a PS3. Stay well clear of HD DVD though.
If you ever get bored, Mircosoft had some IMAX HD video clips - quite impressive actually, you could always link your pc (idealy via DVI or HDMI) and play them through your TV.
One last thing; be wary of screen burn! It can take from around 24hrs of the same still image on a LCD and only 12hrs of the same still image on a Plasma.
Plasma Tv's are not like car aircons - you don't need to get them refilled every so often! However they do weigh a lot more; partly due to the glass front where as LCD generally use plastic.
Try to use quality cables; as in most cheap ones not all the pins are connected!
Dazza :cool: